1. Cohen S: The effects of combined alcohol/drug abuse on human behavior, in Gardner SE (ed): Drug and Alcohol Abuse: Implications for Treatment. Rockville, Maryland, National Institute on Drug Abuse, 1981, pp 5–20.
2. O’Donnell JA, Voss HL, Clayton RR, et al.: Young Men and Drugs—A Nationwide Survey. Rockville, Maryland, National Institute on Drug Abuse, 1976.
3. Carroll JFX, Malloy TE, Kendrick FM: Multiple substance abuse: A review of the literature, in Gardner SE (ed): National Drug/Alcohol Collaborative Project: Issues in Multiple Substance Use. Rockville, Maryland, National Institute on Drug Abuse, 1980, pp 9–24.
4. Johnston LD, O’Malley PM, Bachman JG: Highlights from Drugs and American High School Students 1975–1983. Rockville, Maryland, National Institute on Drug Abuse, 1984.
5. Miller JD, Cisin IH, Gardner-Keaton H, et al.: Highlights from the National Survey on Drug Abuse: 1982. Rockville, Maryland, National Institute on Drug Abuse, 1983.